Method of making check rods for scales



March 3, 1931. JAEN|C HEN 1,794,408

METHOD OF MAKING CHECK RODS FOR SCALES Filed Jan. 16, 1930 g/zm 2;

AYLTORNEY.

-. of check rods, the process enabling Patented Mar. 3, 1931 UNETED STATES LOUIS JAENICHEN, OF SPBI'NGFEELD TOY? PATENT OFFICE SEEP, OAKLAND COUNTY, IVIICHIGAN, AS-

SIGNOR TO THE STANDARD COMPUTING SCALE COIYIPANY, OF DETROIT, MICHIGAN,

A CORPORATION OF LIICHIGAN METHOD OF MAKING CHECK RODS FOR- SCALES Application filed January 16, 1930.

. jecting portion which interferes with the accurate alignment of the edges.

It is an object of the present invention therefore to provide a check rod which can be easily and accurately made, the check rod being divided in its manufacture into a plurality of parts so that, when assembled, a complete check rod is formed.

It is also an object of this invention to provide an improved process for the manufacture greater accuracy and speed in grinding the knife edges to be obtained than has heretofore been the case.

Other objects will readily occur to those skilled in the art upon reference to the fllowing description and the accompanying draw ings in which Fig. 1 shows a scale of a well known type.

Fig. 2 shows in plan one end of a complete check rod user in the scale of Fig. 1.

Fig. 3 shows in plan one end of the body portion only of a check rod.

Fig. i is a section of Fig. 2 on the line 4-4:.

Fig. is a section of Fig. 3 on the line eat-ea.

Fig. 5 is a perspective View of a part of the check rod, adapted to fit into the body of the latter.

Figs. 6 and 7 are sections showing details of assembly.

Fig. 8 is a perspective of a mounting plate used in the scale of Fig. 1.

In the drawings, and especially in Fig. 1, a scale denoted generally at 10 is provided with a Weighing platform 11 mounted upon a beam 12 the latter in turn being pivotally mounted on the knife edge 13 and pivotally connected to the platform supporting rod 14 at the point 15. In order to prevent tipping or improper movement of the platform, a check rod 16,

Serial No. 421,301.

pivotally mounted on the support- 17 and pivotally connected to the platform supporting red at 18, is provided.

The above described construction is well known in the art and my invention relates specifically to construction and manufacture improvements in the check rod 16.

The check rod of my invention comprises a body member 20 shown best in Fi 2, having detachably but securely mounted therein U-shaped pieces 21 fitting snugly in the grooves of the check rod. The body member 20 is al 0 provided with recesses 2.3, each coinciding or a portion of its perimeter with a wall of a groove 22 in Which a U-shaped piece 21 is located, another portion of its perimeter coinciding with an inner wall of a U-piece 21 when the device is assembled.-

Knife edges 25, 26, 27, 28, 29, and 30 are provided in the body and in the U-piece 21 and the knife edges are arran ed in the fol owing fashion 25, 27 and 29 slope downwardly from left to right and 26, 28 and 30 slope upwardly from left to right, referring to F 2 to 4.

In assembling the complete check rod 16 in the scale, apertured plates 82 and 32a are slid over the wings or projecting portions 21a and 21?) of the U pieces 21. The lower end he platform supporting rod 1% "'s then received in one of the recesses 23, seen in Fig. 6 and a bolt is used to connect the rod. 14 to plate and consequently to the check rod In a similar fashion, the upper end of su port 17 is received in the other recess 23, seen in big. '7, and a bolt 3st connects support 17 to a plate 32a and consequently to check rod Rod 1% and support l'fare round in cross section, except where the are cut away to enter recesses These portions of rod 14 and support 1! more or less half-round in section, the flat or hearing faces led and 1M resting against the surfaces of plates 32 and 32a.

The knife edges and 27, abut the inner e of the plate 32 whi e knife ed e abuts bearing 14a of the supporting rod Similarly, edges 28 and abut the inner face of plate 82a, edge 29 abutting the bearing face 17a of support 17.

My improved process enables a check rod to be made accurately, by machinery and by quantity production methods.

in carrying out my process, T first stamp or cut a rectangular blank having Wings 21a and 21b thereon the sha 3e bein eiiactl that illustrated in 2. I then cut or stamp the U pieces 21 from the blank leaving a body 20 having a pair of grooves 22 in its ends spaced by a shallower recess 23. Knife edges 25 and 2. and 28 and are then ground and since Wings 21a and-. 215 are not present during this step, no difficulty is experienced in 'sin'iultane usly and accurately grind lg these edges. 1 then grind knife edges 26 a 29 of the U shaped pie- 21 and since the shaped pieces have open ends no difiiculty is e1; )erienced in grinding these edges. Sharp corners can be obtained and extreme accuracy can be had by this method, due in part, to corner cuts 210 in pieces 21.

I then assemble the parts by replacing or inserting the shaped pieces 21 into the grooves left in the body member when the pieces were cut therefroir. The knife 26 and 25) automatically align with the knife edges and 27, and 2S and 30, and the device is then in its assembled relation and ready for use;

i i tne manufacture of check rods wherein 21a and 21?) are integral with the body, it i. .W found dillicult to align edges 25, 28 and 2?, etc. with respect to each other. Wing disposed between the knife edges, and 2?, for example, prevented measuring of tncse edges and grinding or filing of the same due to the projection the wing 21a into the lath of movement the grinders. Great ditfoulty was experienced in grinding edges 25 a;.d 2? simultaneously, and due to the fact at edge 26 was on the inside of an aperture 2o great difficulty was experienced in grindor filing this edge. liilachine Work, quantity procuction, etc. was not considered possible with devices of this character and until my invention the percentage of rejects was c nsiderably higher.

Now having described the invention and the preferred form of embodiment thereof, it is to be understood that the said invention is to be limited, not to the specific details herein set forth, but only by the scope of the claims which follow.

I claim:

1. The method of making check rods for scales Which includes the steps of providing a blank having a Wing projecting from an end, intermediate its sides, and having an aperture in the body portion longitudinally aligned with said Wing and adjacent thereto, cutting from said blank a U-shaped piece, the base of the U including the Wing, the legs of the U including the side Walls of the aperture, the blank noW having a pair of spaced members at the end thereof and a recess between said members, providing aligned knife edges on the ends of said spaced members; providing a knife edge on the inner Wall of the base of said U-shaped piece; and remounting said U-shaped piece on said blank in the position it occupied before it Was cut therefrom, so that the knife edge on the U-shaped piece is aligned With the knife edges on the adjacent spaced members.

The method of making cheek rods for scales which includes the steps of providing a blank having an aperture centrally disposed therein adjacent one end thereof cutting from said blank a U, the inner Walls of the U including the Walls of the aperture, the blank now having a pair of spaced members at the end thereof; providing aligned knife edges on said spaced members; providing a knife edge on the base of said U and remounting said U on said blank, so that the knife edge on the U aligns with the knife edges on the spaced members.

3. The method of making check rods for scales which includes the steps of providing a blank having spaced members on the end thereof, providing a U adapted to fit between the spaced members; providing aligned knife edges on said spaced members; providing a knife edge on said U and mounting said U in said blank between said members so that the knife edge of the U aligns with the knife edges on the members.

4. The method of making check rods for scales Which includes the steps of providing a blank having a knife edge; providing an insert for said blank, said insert having a knife edge; and combining said insert and said blank so that their knife edges will be aligned.

5. The method of making check rods for scales which includes the steps of providing a blank having a knife edge; providing a U piece having a knife edge; and combining said U piece and said blank so that their knife edges will be aligned.

6. The method of making check rods for scales which includes the steps of providing a blank; cutting from said blank a portion; providing saidblank and said portion With knife edges; and combining said portion and said blank in a position such that their knifeedges are in alignment.

LOUIS J AENIGHEN. 

